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Constraint Cascading Style Sheets for the Web

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Constraint Cascading Style Sheets for the Web Constraint Cascading Style Sheets for the Web Technical Report UW CSE 99-05-01 7 May 1999, Revised 3 August 1999 Greg J. Badros Alan Borning Dept. of Computer Science and Engineering Dept. of Computer Science and Engineering University of Washington, Box 352350 University of Washington, Box 352350 Seattle, WA 98195-2350, USA Seattle, WA 98195-2350, USA [email protected] [email protected] Kim Marriott Peter Stuckey School of Computer Science and Software Engineering Dept. of Computer Science and Software Engineering Monash University University of Melbourne Clayton, Victoria 3168, Australia Parkville, Victoria 3052, Australia [email protected] [email protected] ABSTRACT displayed. Thus, there is a clean separation between doc- Cascading Style Sheets have recently been introduced by the ument structure and appearance, yet the designer has con- W3C as a mechanism for controlling the appearance of HTML siderable control over the final appearance of the document. documents. In this paper, we demonstrate how constraints W3C has introduced Cascading Style Sheets,firstCSS1.0 provide a powerful unifying formalism for declaratively un- and now CSS 2.0, for use with HTML documents. derstanding and specifying style sheets for web documents. With constraints we can naturally and declaratively specify Despite the clear benefits of cascading style sheets, there are complex behaviour such as inheritance of properties and cas- several areas in which the CSS 2.0 standard can be improved. cading of conflicting style rules. We give a detailed descrip- The designer lacks control over the document’s appearance tion of a constraint-based style sheet model, CCSS, which is • in environments different from her own. For example, if compatible with virtually all of the CSS 2.0 specification. It the document is displayed on a monochrome display, if allows more flexible specification of layout, and also allows fonts are not available, or if the browser window is sized the designer to provide multiple layouts that better meet the differently, then the document’s appearance will often be desires of the user and environmental restrictions. We also less than satisfactory. describe a prototype extension of the Amaya browser that CSS 2.0 has seemingly ad hoc restrictions on layout spec- demonstrates the feasibility of CCSS. • ification. For example, a document element’s appearance can often be specified relative to the parent of the element, KEYWORDS: Constraints, HTML, style sheets, CSS, Cas- but generally not relative to other elements in the docu- cading Style Sheets, CCSS, World Wide Web, page layout, ment. Cassowary The CSS 2.0 specification is complex and sometimes vague. • It relies on procedural descriptions to understand the effect INTRODUCTION of complex language features, such as table layout. This Since the inception of the Web there has been tension be- makes it difficult to understand how features interact. tween the “structuralists” and the “designers.” On one hand, Browser support for CSS 2.0 is still limited. We conjecture structuralists believe that a Web document should consist • that this is due in part to the complexity of the specifica- only of the content itself and tags indicating the logical struc- tion, but also because the specification does not suggest a ture of the document, with the browser free to determine the unifying implementation mechanism. document’s appearance. On the other hand, designers (un- derstandably) want to specify the exact appearance of the We argue that constraint-based layout provides a solution to document rather than leaving it to the browser. all of these issues, because constraints can be used to specify declaratively the desired layout of a web document. They With the recent championing of style sheets by the World- allow partial specification of the layout, which can be com- Wide-Web Consortium (W3C), this debate has resulted in a bined with other partial specifications in a predictable way. compromise. The web document proper should contain the They also provide a uniform mechanism for understanding content and structural tags, together with a link to one or layout and cascading. Finally, constraint solving technology more style sheets that determine how the document will be provides a unifying implementation technique. 1 <HTML> <HEAD> We describe a constraint-based extension to CSS 2.0, called <TITLE>Simple Example</TITLE> Constraint Cascading Style Sheets (CCSS). The extension <LINK REL="stylesheet" allows the designer to add arbitrary linear arithmetic con- HREF="simple.css" straints to the style sheet to control features such as object TYPE="text/css"> </HEAD> placement, and finite-domain constraints to control features <BODY> such as font properties. Constraints may be given a strength, <H1 ID=h>Famous Quotes</H1> reflecting their relative importance. They may be used in <P ID=p> At a party at Blenheim Palace, style rules in which case rewritings of the constraint are cre- Lady Astor said to ated for each applicable element. Multiple style sheets are Winston Churchill: available for the same media type (e.g., paper vs. screen) with <BLOCKQUOTE ID=q1> preconditions on the style sheets determining which are ap- If I were married to you, I’d put poison in your coffee. And he responded: propriate for a particular environment and user requirements. <BLOCKQUOTE ID=q2> Our main technical contributions are: If you were my wife, I’d drink it. </BLOCKQUOTE> A demonstration that constraints provide a powerful uni- </BLOCKQUOTE> • fying formalism for declaratively understanding and spec- </P> ifying CSS 2.0. </BODY> A detailed description of a constraint-based style sheet </HTML> • model, CCSS, which is compatible with virtually all of the CSS 2.0 specification. CCSS is a true extension of Figure 1: Example HTML Document CSS 2.0. It allows more flexible specification of layout, and also allows the designer to provide multiple layouts that better meet the desires of the user and environmental be either absolute or relative to the parent element’s value. restrictions. For instance, the style sheet A prototype extension of the Amaya browser that demon- • strates the feasibility of CCSS. The prototype makes use H1 { font-size: 13pt } of the sophisticated constraint solving algorithm Casso- P { font-size: 11pt } wary [4] and a simple one-way binary acyclic finite-domain BLOCKQUOTE { font-size: 90% } solver based on BAFSS [12]. Figure 2: simple.css BACKGROUND Cascading Style Sheets (CSS 1.0 in 1997 and CSS 2.0 in has three rules. The first uses the selector H1 to indicate that 1998) were introduced by the W3C in association with the it applies to all elements with tag H1 and specifies that those HTML 4.0 standard. In this section we review relevant as- first-level headings should be displayed using a 13 pt font. pects of CSS 2.0 [6] and HTML 4.0 [9]. The second rule specifies that paragraph elements should use an 11 pt font. The third rule specifies the appearance of CSS 2.0 and HTML 4.0 provide a comprehensive set of text in a BLOCKQUOTE, specifying that the font-size should “style” properties for each type of HTML tag. By setting be 90% of that of the surrounding element. the value of these properties the document author can control how the browser will display each element. Broadly speak- We can use this style sheet to specify the appearance of the ing, properties either specify how to position the element HTML document shown in Figure 1. Notice the link to the relative to other elements, e.g. text-indent, margin,or style sheet and that we have included an ID attribute for all float, or how to display the element itself, e.g. font-size elements since we will refer to them later.1 or color. Selectors come in three main flavors: type, attribute,and Although the author can directly annotate elements in the contextual. These may be combined to give more complex document with style properties, CSS encourages the author selectors. We have already seen examples of a type selector to place this information in a separate style sheet and then in which the document elements are selected by giving the link or import that file. Thus, the same document may be “type” of their tag. For example, the type-selector H1 refers displayed using different style sheets and the same style sheet to all first-level heading elements. The wildcard type, “*”, may be used for multiple documents, easing maintenance of matches all tags. a uniform look for a web site. Attribute selectors choose elements based on the values of A style sheet consists of rules.Arulehasaselector that two attributes that each element in the document tree may specifies the document elements to which the rule applies, 1Marking all elements with ID attributes defeats the modularity and re- and declarations that specify the stylistic effect of the rule. use benefits of CSS; we over-use ID tags here strictly as an aid to discussing The declaration is a set of property/value pairs. Values may our examples. 2 HTML <HTML> <HEAD> <TITLE>Table Example</TITLE> <LINK REL="stylesheet" HEAD BODY HREF="table.css" TYPE="text/css"> </HEAD> TITLE LINK H1 P <BODY> <TABLE ID=t> <COL ID=c1 CLASS=medcol> BLOCKQUOTE <COL ID=c2> <COL ID=c3 CLASS=thincol> BLOCKQUOTE <TR> <TD COLSPAN=2> Figure 3: Document tree for the HTML of Figure 1. <IMG ID=i1 SRC="back.gif"></TD> <TD><IMG ID=i2 SRC="next.gif"></TD> </TR> optionally provide: CLASS and ID. Multiple elements may <TR> specify the same CLASS value, while the ID value should be <TD>Text1</TD> unique. <TD>Text2</TD> <TD>Text3</TD> Selection based on the CLASS and ID attributes provides con- </TR> siderable power. By using CLASS attributes and selectors, the </TABLE> author can categorize various document elements into groups </BODY> and then apply different formatting to each of the groups.
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